A perfume that mentally erases all traces of the mage around the edges to those who inhale it. They can technically still be seen, but its like eyes just keep sliding off of them, like they aren’t really there. Like a 'Somebody Else's problem field, they make themselves less noticeable and make it harder for the opponent to focus attention upon them. That means the mage is free to move and attack before opponent can even register it coming. And by moving fast enough, the mage really does become invisible, just so long as no one is focusing on where they are standing.